Stovepipe or the like



Dec. 10, 1929. w HUENEFELD 1,739,233

STOVEPIPE OR THE LIKE Filed March 8, 1929 gmnntoz 11 fl dler E. Haendelddbtommq Patented Dec. 10, 1929 WALTER E. HUENEFELD, OF CINCIIiTNATI,OHIO STOVEPIPE OR THE LIKE Application filed March 8, 1929. Serial No.845,360.

This invention relates to improvements in stove pipes or the like, andmore especially to a novel joint for connecting the edges of a pipesection of the character employed with knock-down stove pipes.

The primary object of the invention is to furnish such pipe section withan automatic spring self-locking seam, designed to join the oppositeedges of the pipe section in such manner that the seam does not have tobe hammered down before the pipe section is put in use, although it maybe hammered down if desired.

A further object is to provide a novel seam for a stove pipe section ofthis character, which permits the side edges of the pipe section toimmediately interlock with one another when said edges are placed inabutting relation. 1

A still further object is to furnish a knockdown stove pipe sectionseam, which, while efi'ectively holding the side edges of the pipesection in position, nevertheless permits such edges to be detached fromone another without distorting the pipe section.

Another object is to provide a novel seam which is closed entirely atthe exterior, in

contradistinction to the known types of seams which have the rior.

With the foregoing objects outlined and with other objects in view whichwill appear as the description proceeds, the invention consists in thenovel features hereinafter described in detail, illustrated in theaccompanying drawing, and more particularly pointed out in the a pendedclaims.

Referring to the rawing.

Fig. 1 is a perspective view of a stove pipe section provided with myimprovement.

Fig. 2 is an enlargedperspective view of a portion of one end of thepipe section.

Figs. 3, 4 and 5 are views similar to Fig. 2, but illustratingmodifications.

In the drawing, 5 indicates a resilient sheet metal pipe section havingits opposite side edge portions 6 and 7 joined to form a stove pipesection.

One of these edge portions is bent outwardly to provide a neck 8, thatjoins a hook opening on the exte-' end of the inner hook portion 9 tothe main portion of the pipe section. The parts 8 and 9 provide ashallow internal cavity 10, and a deep internal cavity 11, and it willbe noted that the parts 8, 9, 10 and 11 preferably. extend the fulllength of the pipe section.

The opposite edge portion 7 is bent to provide an outwardlyextendinghook 12 which interlocks with the extremity 13 of the hook 9,and the extremity of the hook 12 is bent back upon itself to provide asubstantially U-shaped nose 14, which fits into the cavity 11, and thisnose has a curved or bent extension 15 which takesinto the shallowcavity 10.

F i 2 shows the parts interlocked, and it will e noted that a slightclearance is provided at the points 16 and 17, so that when the parts 6and 7 are pulled away from each other, the nose 14 will move as far asit can into the cavity 11, and at such time, the end of the extension 15may readily swing out of the cavity 10, using the edge of the extremity13*as a fulcrum.

In this way, the edges may be readily detached from one another,providing, of course, that the same has not been hammered down.

In order to join the edge portions and make the seams, it is onlynecessary to insert the nose 14 into the cavity 11, and then permitthese edge portions to spring outwardly, due to the resilency of themetal.

Instead of curving the extension 15, as shown in Figs. 1 and 2, saidextension may be left flat, as illustrated at 18 in Fig. 3, but ineither instance, the parts will function in a similar manner.

It is not absolutely necessary to bend the back to form the extension15, for instead the hook 12 may be specially bent, as shown at 12 or 12in Figs. 4 and 5 so as to provide extensions to enter the shallow groove11" or 11?. In each form the part which enters the shallow groove maymove out of the same when the edges are pulled toward one another andthe extension is swung inwardly out of the shallow groove.

My improved joint may be used preferably without any distortion of theseam, as

manlifactured, as it is only necessary tointerlock the edge portions andlet the resiliency of the metal lock the parts together for practicaluse. Furthermore,

as my lock is on the exterior of the pipe, no open space is left on theoutside, which would render the blank dangerous to assemble, owing tothe liability of the metal cutting thefingers while the edge portionsare being joined together.

From the foregoing it is believed that the construction, operation andadvantages 0 the invention may be readily understood, and I tending neckterminating in an external hook,

I, along one of its side edges,

said neck and hook providing opposed shallow and deep cavities, theother ed e portion having an internal hook to interloc with the firstmentioned hook, and a nose to extend into said deep cavity, and anextension merging into said internal hook and normally projectin intosaid shallow cavity, the extremit 0 said extension being free to swinginwar ly out of the shallow cavity when said edge portions are swungrelatively to one another, while using the extremity of the externalhooks as a fulcrum.

2. A pipe section comprising a metallic sheet, one side edge portion ofwhich is provided with an outwardly extending neck which merges into ahook, the neck and hook providing internal opposed shallow and deepcavities, the other side edge portion of the sheet having a hook-shapedportion designed to interlock with the first mentioned hook, and beingbent back upon itself to provide a nose that extends into said deepcavity, and an extension merging into said nose and normally extendinginto the shallow cavity, said hooks being tightly interlocked,permitting the extension to move out of the shallow cavity when the edgeportions are swung relatively to one another, while using the edge ofthe'first mentioned hook as a fulcrum.

3. A sheet metal stove pipe section having an outwardly extending neckterminating in an external hook, said neck and hook providing opposedshallow and deep cavities, the other edge portion having a hook tointerlock with the first mentioned hook, and a nose to extend into saiddeep cavity, and an extension merging into said nose and normallyprojecting into said shallow cavity, the edge of said extension beingfree to swing inwardly out of the shallow cavity when said edge portionsare swung relatively to one another, while usmg the extremity of thefirst mentioned hook as a fulcrum, said extension being arrangedsubstantially at an angle to said nose.

4. A pipe section comprising a metallic sheet, one side edge portion ofwhich is provided with an outwardly extending neck which merges into ahook, the neck and hook providing internal opposed shallow and deepcavities,- the other side edge portion of the sheet having a hook-shapedportion designed to interlock with the first mentioned hook, and

f being bent back upon itself to provide a nose that extends into saiddeep cavity, and an extension merging into said nose and normallyextendin into the shallow cavity, said hooks when tig tly interlocked,permit-ting the extension to move out of the shallow cavity when theedge portions are swung relatively to one another, while using the edgeof the first mentioned hook as a fulcrum, said extension being arrangedsubstantially at an angle to the nose.

5. A sheet metal stove pipe section having along one of its side edges,an outwardly extending neck terminating in an external hook, said neckand hook providing opposed shallow and deep cavities, the other edgeportion having a hook to-interlock with the first mentioned hook, and anose to extend into said deep cavity, and an extension merging into saidnose and normally projecting into said shallow cavity, the edge of saidextension being free to swing inwardly out of the shallow cavity whensaid edge portions are swung relatively to one another, while using theextremity of the first mentioned hook as a fulcrum, all parts of thejoint being. arranged exteriorly of the pipe section.

In testimony whereof, I have signed this specification.

WALTER E. HUENEFELD.

